Location of mosquito sampling sites and species detected in Mexico City for 2004. The map of Mexico City displays the distribution of the mosquito species identified in the collection sites with some climatic and geographic features including humidity, isohyets, isotherms and surrounding states. Numbers in black indicate morphological identification of Culex spp.; in blue Culex spp., Culiseta and Ochlerotatus; in red Culex spp. and Culiseta; in purple Culex spp. and Ochlerotatus; and in brown Culex spp. and Cx. tarsalis.